Setting of netmask on SUN system running Solaris 8

I have changed the netmask 255.255.240.0, but after reboot, the netmask is as before- taking again the old value. The netmask 255.255.240.0 IP address 10.1.32.228 while the gateway is 10.1.32.1. What wrong is it the network number?
Thanks
MM

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